Sheet Conveyance State Detection via Motor Torque Analysis
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Solution Overview
Problem
Existing sheet conveying devices face challenges in accurately determining the sheet conveyance state and detecting deterioration of conveyance members, especially at the initial stages, due to small changes in the amount of movement per unit time, leading to inefficiencies and inaccuracies in determining the condition of sheet conveyance members.
Innovation Solution
A sheet conveying device is designed with a first sheet conveyor and a second sheet conveyor, along with a determiner that assesses the sheet conveyance state based on the torque of the motors driving the rollers, allowing for precise detection of sheet conveyance and member deterioration by analyzing the torque changes and sagging of sheets between the conveyance units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the amount of movement of sheet per unit time is used to determine sheet conveyance state, then the determination can be made based on simple measurement, but the detection precision is insufficient especially at initial stages of deterioration
Solution Approach 1:
The invention changes the measurement parameter from sheet movement amount to motor torque. By detecting torque changes in the motor driving the conveyance roller, the system can identify sheet conveyance state and deterioration with higher precision, especially in initial stages, without significantly increasing system complexity.
Solution Approach 2:
The invention replaces mechanical measurement methods (detecting sheet movement) with electrical measurement methods (detecting motor torque). This substitution enables more sensitive detection of conveyance state changes while simplifying the overall determination mechanism through electronic sensing.
2Productivity
If multiple detection sections with non-overlapping time zones are used to calculate sheet movement ratio, then the productivity is improved through parallel detection, but the measurement precision deteriorates due to small changes in movement amount
Solution Approach 1:
The invention changes from measuring sheet movement amount to measuring motor torque directly. This parameter change enables high-precision detection of conveyance state without requiring multiple detection sections or complex ratio calculations, thus maintaining productivity while improving precision.
3Reliability
If the sheet conveyance member deterioration is determined by comparing calculated ratio with reference value, then the determination process is simplified, but the reliability is reduced due to inability to detect initial stages of deterioration
Solution Approach 1:
The invention uses motor torque as the detection parameter, which provides higher sensitivity to conveyance state changes. This enables reliable detection of initial deterioration stages while keeping the determination system relatively simple through direct torque measurement and comparison.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables accurate determination of sheet conveyance states and timely detection of conveyance member deterioration, improving the efficiency and reliability of the sheet conveying process by utilizing torque changes and sagging characteristics to assess the condition of the conveyance system.
Implementation Method 1
The first sheet conveyor is configured to interpose the sheet between the first sheet feed roller and the second sheet feed roller and convey the sheet to the second sheet conveyor as the first sheet feed roller rotates
Implementation Method 2
a conveyance roller, and a second motor configured to rotate the conveyance roller
Data Source
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AI summary
A sheet conveying device (200) includes a sheet pickup body (221), a first sheet conveyor (251, 255, 252), and a second sheet conveyor (271, 272), which are disposed in this order along a sheet conveyance direction, and a determiner (553). The determiner (553) is configured to determine a sheet conveyance state of a sheet based on at least one of torque of a first motor (252) of the first sheet conveyor (251, 255, 252) and torque of a second motor (272) of the second sheet conveyor (271, 272). The first sheet conveyor (251, 255, 252) is configured to interpose the sheet between a first sheet feed roller (251) and a second sheet feed roller (255) and convey the sheet to the second sheet conveyor (271, 272) as the first sheet feed roller (251) rotates.